just a floor
With the Hambro product, Canam meets the needs of residential and multi-residential markets by providing owners, real estate developers and general contractors with optimized construction solutions.
Canam offers an array of structural components, including the Hambro D500 composite floor system, a composite girder and a transfer slab system, which can be combined in order to design better adapted and more functional buildings.
The Hambro D500 composite floor system is your cost-effective answer to solid, reliable elevated slabs supported by proven floor joists. Compatible with all traditional structural systems, the Hambro D500 floor combines the flexibility of the D500 joists with the strength of a reinforced concrete slab.
Fast and easy to install, the Hambro floor provides many benefits:
By combining Hambro steel joists with the poured concrete, the system forms composite T-beams that are integrated in the transversally reinforced continuous slab. The bottom chord acts as a tension member during the concreting process while the web systems, which are made from bent rods, serve to resist vertical shear.
The top chord withstands compressive action during the non-composite stage and subsequently functions as a continuous shear connector between the steel and concrete through adhesion and friction. The slab is reinforced with welded wire mesh.
The reinforced concrete slab also contributes to the transfer of horizontal loads (wind, seismic activity) and acts
to stiffen multistory buildings.
The ease and speed of installing the Hambro D500 floor system eliminates the need for skilled trades.
1. POSITIONING OF JOISTS
The joists are placed on the walls or beams and positioned in compliance with the shop drawings issued for construction by Canam. The joist connection methods are also shown on the Canam drawings.
The rollbars are designed to support the plywood forms, concrete construction load. When rotated and locked into the notches in the top chord, the rollbars lock the joists in place while providing lateral and torsional stability to the joists. Bottom chords are fabricated with clips to accommodate rollbars if temporary bridging is needed during
the pouring process. Generally, no permanent bridging or shoring is required unless specifically noted.
3. PLYWOOD FORMS
Together, the plywood and the rollbars form a rigid diaphragm during construction, providing a safe platform for workers. The Hambro system uses standard 4 ft x 8 ft x ½ in.2 (1,200 mm x 2,400 mm x 13 mm2) plywood sheets.
4. SHEETS OF MESH
Welded wire mesh serves as the standard catenary for the slab. Standard 8 ft x 20 ft (2,400 mm x 6,100 mm) sheets of mesh are easily placed over the top chords of the Hambro joists. The top chord acts as a high chair.
5. CONCRETE POURING AND FINISHING
When pouring and finishing a Hambro slab, it is not necessary to complete the entire deck in a single pour. In the event that the pour is interrupted parallel to the joists, the joint should be midway between the joists, but never less than 6 in. (152 mm) from the top chord in order to ensure composite action.
6. REMOVAL OF PLYWOOD FORMS
When the concrete attains a cylinder strength of 500 psi (3.5 MPa), the rollbars and plywood forms can be removed. When the concrete attains a cylinder strength of 1,000 psi (7 MPa), the floor is ready but care must be taken not to surpass the admissible loads for the specified capacity.
The Hambro girder act as a principal beam supporting the Hambro D500 joists wich are installed perpendicular on each side. Developed for the multi-residential and commercial markets, the Hambro composite girder offers greater spans than the conventional steel girder while maintaining a minimum depth to adapt to the Hambro joists.
Designed to address the need for longer spans and better ductability, the Hambro composite girder is composed of a top and bottom chord, each made of two angle sections.
Utilizing a concrete slab in the overall design of the Hambro girder allows a better span-to-depth ratio than that of a conventional girder. Although a ratio between 24 and 27 generally represents an efficient and economical solution, a composite product can reach a ratio of up to 30. For example, in the case of a 30-ft girder, the optimum depth is approximately 14 inches while the minimum depth is 12 inches.
Due to the composite design of the Hambro girder, the top and bottom chord members are smaller than those of a conventional girder. This provides for wider openings between the members. The vertical members of the Hambro girder are aligned with the joists bearing on the top chord, maximizing the size of the openings between the diagonal members and the bottom chord.
Composite Hambro girders form an integral part of the composite Hambro floor system and therefore can reach a fire resistance rating of up to 3 hours, depending on the type of ceiling used
Composite Hambro girders are ideal for floors requiring long spans since fewer columns are utilized. The optimum span of a composite Hambro girder ranges between 25 and 35 ft.
Hambro girders and joists, designed with a camber according to the dead load of wet concrete, become level after the pour. This provides the flexibility to install the ceiling directly beneath the bottom chord in accordance with ULC and UL specifications.
With a concrete slab and steel members incorporated into its design, the composite Hambro girder can be designed to carry multiple floor loads. Contact us for more information.
The longitudinal shear that occurs between the concrete slab and the steel girder is due to the action of the following four elements:
|Connections to effectively transfer shear loads|
The Hambro transfer slab the practical and smart alternate design to conventional podium concrete slabs. The transfer slab is a floor system that transfers the superimposed loads from the structural building frame above the slab to the columns, walls and foundations below.
|Smart alternative to conventional concrete podium slabs|
The Hambro transfer slab designed by Canam is composed of Hambro joists and girders in composite action with a concrete slab, which makes it easy to install.